取得網路資訊

取得本機網路IP：

System.Net.IPAddress[] addressList = System.Net.Dns.GetHostByName(System.Net.Dns.GetHostName( )).AddressList;
string s="";
for ( int i = 0; i < addressList.Length; i++ )
{
      s += addressList[i].ToString( ) + "\n";
}
textBox1.Text = s ;                                  //顯示 IP  

取得網卡序號：

ManagementClass mc = new ManagementClass("Win32_NetworkAdapterConfiguration");
ManagementObjectCollection moc = mc.GetInstance();

string str="";
foreach( ManagementObject mo in moc )
{
    if((bool)mo["IPEnabled"] == true) str = mo["MacAddress"].ToString();
}
return str ;                                  //返回網卡序號  

是否存在網路：

SystemInformation.Network ==  true  //已連上網路
                          ==  false //未連上網路

網路連線狀態：

SystemInformation.PowerStatus.PowerLineStatus == PowerLineStatus.OffLine   //離線
                                              == PowerLineStatus.OnLine    //連線
                                              == PowerLineStatus.Unknown   //未知